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opal is amorphous minerals so it symmetrical and formulas symmetry class not ???

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asked Dec 19, 2015 by Nhật Linh (170 points)

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If I understand your question, you wish to know more about opal. It is amorphous. Opal is a silica SiO2.nH2O for a formula. It is classed as a mineraloid. It is anywhere from 6-20% water. I hope that helps.

It is not a true mineral because it does not form crystals. Yet, it is always listed with minerals.

answered Dec 20, 2015 by Weasel (52,070 points)
reshown Dec 21, 2015 by Weasel